http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
This entertaining video reviews several verb tenses in Spanish. It teaches how to conjugate and properly use the imperfect tense.
with Carlos Z. Gomez and Janet R. Hafner.
Title from resource description page (viewed February 01, 2016).